oops, remove old packages when updating

diff --git a/utils/ghc-pkg/Main.hs b/utils/ghc-pkg/Main.hs
index 3f8b0b3..b2f7d18 100644 (file)
--- a/utils/ghc-pkg/Main.hs
+++ b/utils/ghc-pkg/Main.hs
@@ -401,7 +401,8 @@ registerPackage input defines flags auto_ghci_libs update force = do
 
   let pkg = resolveDeps db_stack pkg0
   validatePackageConfig pkg db_stack auto_ghci_libs update force
-  let new_details = snd db_to_operate_on ++ [pkg]
+  let new_details = filter not_this (snd db_to_operate_on) ++ [pkg]
+      not_this p = package p /= package pkg
   savePackageConfig db_filename
   maybeRestoreOldConfig db_filename $
     writeNewConfig db_filename new_details